and how is it performed? what are the benifits? how about the drawbacks? pretty new to this game. I work on airplanes for a living they aren't even as technical as the mn12
The picture below shows where a hose would be (between the two caps) that can be removed.
Someone actually ran their car over a dyno with the hose on and off to see real results. He posted his result on the thread below. There was some good conversation after. Regardless, the dyno results show it really doesn't help to delete the hose.